From the beta release onwards: Settings → Account → Delete account. Deletion is immediate and permanent.
Email support@clashpoker.app with the subject "Delete my account", sent from the device you play on (or including your in-game display name). We delete within 30 days and confirm by reply.
Your player account, display name, progression, in-game currency balances, and device link. Purchase ledger records are retained for 6 years in anonymised form (UK accounting law) — they no longer identify you. Server logs age out within 90 days.